i have the same problem as mentioned above. using latest 4.23.06 version of designer. haven’t tried api yet.

if i open examples the reverb occlusion works. if i create a new project, add a normal wav sample, make a 3d event out of it, add custom distance parameter, create an occlusion effect, set up the curves, then create a default reverb, override with it some strong reverb (stone room), activate it, play the event and slide the parameter, the reverb effect is constantly at maximum, while direct occlusion effect works.